Support for PDF as well as DOCX files is experimental, and Amazon is warning that "some complex PDF and DOCX files might not format correctly on your Kindle."

The other change has to do with pricing; from now on, Amazon will charge 15 cents per megabyte for wireless uploading of personal documents to your Kindle - rounded up to the nearest whole megabyte. This is effectively quite a large price increase, since up until now the fee was 10 cents per document, regardless of the size.

Mashable
is a global, multi-platform media and entertainment company. Powered by its own proprietary technology, Mashable is the go-to source for tech, digital culture and entertainment content for its dedicated and influential audience around the globe.